vocal sac


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vocal sac

n.
An inflatable pouch on the floor of the mouth cavity of a male frog that amplifies sounds produced by the vocal cords.
References in periodicals archive ?
Other behaviors observed during bouts, but not quantified because of infrequent occurrence, included 1) gaping--repeated opening and closing of the mouth in a stationary frog; 2) front leg lifts--raising and lowering of the front leg; 3) sitting up--elevation of the anterior portion of the body and head; and 4) partial inflation of the vocal sac without sound production--this usually occurred after a vocalization, so that the vocal sac was not collapsed completely once a call was finished, or before a vocalization, so that the vocal sac was inflated for a time before a call began.
3 % eye length; a single postrictal tubercle; choanae small, round, not concealed by palatal shelf of maxillary arch; vomerine odontophores median and posterior to choanae, oval, bearing slightly elevated row of 2-5 teeth, separated medially by space nearly equal width of an odontophore; tongue longer than wide, posterior 1/5 not adherent to floor of mouth, posterior edge not notched; vocal slits long, well lateral on floor of mouth; vocal sac subgular.
Males of this species have paired vocal slits opening into a single vocal sac.
2), ending at level of posterior edge of choanae; tongue wider than long, without posterior notch, posterior edge not free from floor of mouth; vocal slits short, just medial to posterior end of mandible; vocal sac median, subgular, single (or perhaps bifid).
We also describe the cranium and vocal sac structure of the new species.
Dorsum, chest, and gula smooth; belly skin granular; vocal sac prominent tending to be bilobed when inflated; an incomplete chest fold, folds of skin at wrist, knee and heel; axillary membrane small.
He and his colleagues have videotaped a frog hopping over to Roborana, pouncing on top of the robot, and swiping at the vocal sac.
In most species, the deflated vocal sac of males shows a pair of) (shaped folds.
A throat pouch called a vocal sac swells up like a balloon.
A gravid female entered the territory of an advertising male, visually fixed his pulsating vocal sac, crouched in front of and slid underneath him, who then guided her with strutting strides to the sheltered, moist and dark oviposition site.
That big bubble under the tree frog's throat is his vocal sac.
Its skull shows that the big primate had an enlarged vocal sac, which it used to communicate over long distances, as howler monkeys do today.